Mineral oils: processes and products – Refining – Purifying used oil
Patent
1977-04-26
1978-02-14
Gantz, Delbert E.
Mineral oils: processes and products
Refining
Purifying used oil
208181, 208184, 208211, C10M 1100
Patent
active
040737195
ABSTRACT:
A re-refining process is described by which high-quality finished lubricating oils are prepared from used waste lubricating and crankcase oils. The used oils are stripped of water and low-boiling contaminants by vacuum distillation and then dissolved in a solvent of 1-butanol, 2-propanol and methylethyl ketone, which precipitates a sludge containing most of the solid and liquid contaminants, unspent additives, and oxidation products present in the used oil. After separating the purified oil-solvent mixture from the sludge and recovering the solvent for recycling, the purified oil is preferably fractional vacuum-distilled, forming lubricating oil distillate fractions which are then decolorized and deodorized to prepare blending stocks. The blending stocks are blended to obtain a lubricating oil base of appropriate viscosity before being mixed with an appropriate additive package to form the finished lubricating oil product.
REFERENCES:
patent: 1766768 (1930-06-01), Werkenthin
patent: 3639229 (1972-02-01), Brownswell et al.
patent: 3763036 (1973-10-01), Jordan et al.
patent: 4021333 (1977-05-01), Habiby et al.
Cotton Faye O.
Goetzinger John W.
Reynolds James W.
Whisman Marvin L.
Carlson Dean E.
Gantz Delbert E.
Hellwege James W.
Jackson Frank H.
The United States of America as represented by the United States
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